SQL Reference

Example

CREATE TABLE test_table (number INT, name VARCHAR(20));
INSERT INTO test_table VALUES (1, 'Tom'), (2, 'Jerry');
SELECT * FROM test_table;

Output

+--------+-------+
| number | name  |
+--------+-------+
|      1 | Tom   |
|      2 | Jerry |
+--------+-------+

Explanation

The above example demonstrates the use of the INTO keyword in SQL, specifically MySQL. A new table, test_table, is first created with two columns, number and name. Then, two rows of data are inserted using the INSERT INTO statement. The SELECT * FROM statement is used to display all rows from test_table.

Example

SELECT *
INTO NewTable
FROM OldTable
WHERE Condition;

Output

Command(s) completed successfully.

Explanation

The example query duplicates an existing table named ‘OldTable’ and creates a new table named ‘NewTable’ with the same data structure and values - only for records that satisfy the given ‘Condition’. The result of the command isn’t a data set but a completion notification.

Example

DECLARE
  text_var VARCHAR2(100);
BEGIN
  SELECT 'Hello, Oracle!'
  INTO text_var
  FROM dual;

  DBMS_OUTPUT.PUT_LINE(text_var);
END;

Output

Hello, Oracle!

Explanation

In the example, a variable text_var is declared to store text data. The SELECT INTO statement retrieves the string ‘Hello, Oracle!’ and assigns it to text_var. The DBMS_OUTPUT.PUT_LINE procedure prints the value of text_var, resulting in the output ‘Hello, Oracle!’. The FROM dual clause is a Oracle-specific syntax to select from a dummy table.

Example

CREATE TABLE Employee (Name STRING, Age INT);
INSERT INTO Employee (Name, Age)
VALUES ('John Doe', 30);

Output

sqlite> SELECT * FROM Employee;
John Doe|30

Explanation

The INSERT INTO statement is used to insert new records into a table in SQLite. In the example, a new record is created for ‘John Doe’ with age ‘30’ in the ‘Employee’ table.